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node_modules/react-native-screens/ios/events/RNSScreenViewEvent.mm

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+#import "RNSScreenViewEvent.h"
+#import <React/RCTAssert.h>
+
+@implementation RNSScreenViewEvent {
+  double _progress;
+  int _closing;
+  int _goingForward;
+}
+
+@synthesize viewTag = _viewTag;
+@synthesize eventName = _eventName;
+
+- (instancetype)initWithEventName:(NSString *)eventName
+                         reactTag:(NSNumber *)reactTag
+                         progress:(double)progress
+                          closing:(int)closing
+                     goingForward:(int)goingForward
+{
+  RCTAssertParam(reactTag);
+
+  if ((self = [super init])) {
+    _eventName = [eventName copy];
+    _viewTag = reactTag;
+    _progress = progress;
+    _closing = closing;
+    _goingForward = goingForward;
+  }
+  return self;
+}
+
+RCT_NOT_IMPLEMENTED(-(instancetype)init)
+
+- (NSDictionary *)body
+{
+  NSDictionary *body = @{
+    @"progress" : @(_progress),
+    @"closing" : @(_closing ? 1 : 0),
+    @"goingForward" : @(_goingForward ? 1 : 0),
+  };
+
+  return body;
+}
+
+- (BOOL)canCoalesce
+{
+  return NO;
+}
+
++ (NSString *)moduleDotMethod
+{
+  return @"RCTEventEmitter.receiveEvent";
+}
+
+- (NSArray *)arguments
+{
+  return @[ self.viewTag, RCTNormalizeInputEventName(self.eventName), [self body] ];
+}
+
+@end